INTERNATIONAL: World number one Ash Barty on Thursday withdrew from the Indian Wells and the Miami Open tennis tournaments, saying her body has not recovered after her January triumph at the Australian Open.

The 25-year-old Australian has struggled with shoulder, back, and foot injuries during her career, in which she has won three different Grand Slam events.

"Unfortunately, my body has not recovered the way I'd hoped after the Australian Open and I have not been able to adequately prepare for Indian Wells and Miami," she wrote in a message on Twitter.

"I don't believe I am at the level necessary to win these events and as a result I have decided to withdraw from both tournaments," she said.

"I love these events and am sad not to be there competing but getting my body right must be my focus."

Barty's opponent in the Australian Open final, top-ranked American Danielle Collins, also withdrew from Indian Wells on Thursday, citing a "continuing injury".

The Indian Wells main draw begins next week with the Miami Open following at the end of the month.